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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977152527023e39e73d68c2567a5a2c21374930f4c0d29a755fbe1ffdb025adf' 
  AND token = '2ykOW9GysDdlu0u11agFs4Mje76t+1GhqWXMt9xsyz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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