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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eabdbdfc13c2617e6beb42a6002718c71da4594e06eb3d490115a3be690751aa' 
  AND token = 'bETKOnmFIGsSAmbf6lQRghqvLyti6ZikclSo8ZYd2IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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