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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1df615203503201bba87f81434fdbf6e650202225a334b8d220c2f2a39bc637' 
  AND token = 'if//z2WK9KJN9ZzFSkBwiXir1EFi+iTyz+vcRlF7ljU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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