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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd6b926044ec4aee7f4a720fdd03d9e74637b342c19b7a71df899d737610318' 
  AND token = 'ZfuwpW6QD5UmrCTDdXXZwr5weygnz2gYHeuvljLOz24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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