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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae17c403da8d4ca67fb51c945eebae1fc1560a1c8930491012ea58a1ab5cdcc' 
  AND token = '7T5WsWgSYWFa+yi6K9BZhig3qCt2UyyLdywMflWvB4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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