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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d9ca30e4deec76ecadccddd185181e384140731630da34c57b54a2dbd63a5a' 
  AND token = 'u1lZz/S5v4FJf0NEZ5qjBX50jdAXiEtkwJ4E47wmAzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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