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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2cd74e16af56a9624851bf4aa8db8eaa34d2e2690d47269f1e163743d3eefc4' 
  AND token = 'AMBcbGlen/38BGBUBrlIG9foX0BtUN0e93/3nSoYiJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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