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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe1437070db6099d41f47c064f6dddca6d4ed3c848616c01d36eb609a2456e0' 
  AND token = 'HkEnKZyA/fLOO+77sMYuDUexdxYJ5d2FeYO3tFQFRxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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