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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80fb4f90420c7ee405b12fb947568f1375b82582c0b347058fb1188ca70283c' 
  AND token = 'ArbMtq5Ze7YmuGvvipxnDaQDvRmhdFirduQanZChaT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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