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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43b492a5564938f56c79f7759aa2aaab094897197f801535fa37a6b5ce5bfbc2' 
  AND token = 'uOtjFgAc0T+U0uD8ht3IytmL3E85D8mZridow/I5Hko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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