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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b1293af19c825a871bf940fc0e3124457c6610520fff9d22629a0c471a78d3' 
  AND token = '7kENFwRKbr9oHYtGpMPAKKRRL3pEUsKnZThhGoL6NwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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