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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8fc0692861deaff27aee4ab91dcf3430025677aafe5376dd3de0e14e61f335' 
  AND token = 'l1x1+FNqK7xxOmdBnyUCug3oU16z4yIaEbqKtX29vzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}