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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79717726f6aaa460c8683d2d7b2e650ca147c3bba8659f81cdb2a4ec61e991f' 
  AND token = '1NBIMv6sd4SfnAX10LEhmki15ZpRy2tnB94umeD8NrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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