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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15532fd37be84a7c08478f4dc8b1fa95e4cd80f60c618fbe4d1e590882b7572e' 
  AND token = 'bT4fOjpaav/Gzn1OMZGZ4bUSj2De0jje+h8WRfz4MMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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