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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e71b2e0bae5214e3c6749ef9d750c76028fe7d4997b46bbd94ad6bddcfffac' 
  AND token = 'WNfd9obBQ720Jtm0h+glw1JztkAs+LiPAMX7APA5IkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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