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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008caf1a68e8bb410a650014d45d8c8a8dab133f6d778e2ffb137c87ccf03bab' 
  AND token = 'c3XQNOdhaSF2GtD5feVgDM7qvV5h/9OXGJB/Jtso7EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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