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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd588b19a1a379ec3ac0c73d417161b2cee001fc87edefce26f5781f5337d02c9' 
  AND token = 'F4KxCl7vn+wLnWCIN8uYv2psgMkqPuHIYsLj6w+cX6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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