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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '992f47c018a17ad84ab93395298d1881ea5a71348d2257f411b3d27f8e635617' 
  AND token = '9mXOzP45l0psx5Y6ZAQ+87gcdiZI2qlqCkOxAs0ZF9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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