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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fabe6212d4044ddf32975ec6089da209be1f865c11e5468ced53a785b4a5bc' 
  AND token = '+Z4Y/e2xfiqYGZcI3DEbUY12U5RNXyi9tAhwGIf3HNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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