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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04233b79b5a1656bfef8e0f3efcfe4e0d6dd259fef9439014f7e324b86e50aed' 
  AND token = 'jnpcYRVuS1mdLnbLJ405nOAHJgWdVrudxuFhinFYg5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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