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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bed85e8a4b210f3695e5b49ad4134f5b26fa7dfd6d15d30eaac15f89c52613' 
  AND token = 'lcQAVK3KfiX47LpIpriVk23G11yZPoYZItCeFsgzpyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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