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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789f670a3672d9cfd05100db7f29449e80c340ff7e510500f4ea7afeda73a9e3' 
  AND token = 'UInqTJoo24baxZEvbRElt78zAYT96HKNadJJCvpif7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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