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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c769346dc5369b22a0ad3e01cdccdc9a46ead69bae12701d7060eddf8af87587' 
  AND token = 'OvgL7JvY73QuKN+yA6Fn8dMdCNEW9mDx0ksUMG1usnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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