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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fceda3efe1876760d7bf093e64205eb7e97efc7a283cc7c2169b7b4efb26f63e' 
  AND token = 'FIM7BhvxWk65BGE2MMbdq3j/wsWMopU+pXiGPJjM+WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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