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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b8990f2f2b2c062e2a3ceb52f7f3f298f555dd92437e6e569276799dbdea2b' 
  AND token = 'XgFG7zpkOR7CKrpffCyzrnPDSebQZRF0sT698Es/7wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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