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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c3df2fa770c555c8ed13d5c2c048df4070caf6997dcefa709a6f8e1d6b2b8f' 
  AND token = 'gUTvZJpliTDNjeGzigw997thipScD+vMfafoNFMh24c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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