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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127b1aa3536e026cc3473b143c84ce68ab58c505afa35e822989487ed6134df4' 
  AND token = 'DH7S+u2c9X/20Ri7JIB4QNJUddOpxRxmdJFqMeXKP3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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