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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10ba1c546b0788cf5a222c7b9513dd0e6da4e2442fa1d547eb5104100613d9f' 
  AND token = '4SeZoV+hacqikq5LCqN5ixZlKI9preKTdPIIZ8y5JvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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