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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca35c0226cf2239571d9b1b255bdd4156614829ec5be02c60ff004c56dd252b' 
  AND token = '1owGhIssv19vdAJ/HNSq4pX3uMwLXhtH+xBvDt6lYhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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