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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dfef6f19be1de7d4c7d8e97c8de0553b01ed13a539755a47809998b78cdb1be' 
  AND token = '3bxusvlaOwQaO5PabWCx9VQXEVZu55SDKUyKB6fy+c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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