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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd153d929c7513e7eb0ad6bb9c276ffe6d0f26242e4e0d22751a7117592382c' 
  AND token = 'lZpHn23w3ZMFB39DOaj62qFCmrvVx4zFpLG9cnqw6qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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