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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83602c7e460bead0b5cbd10f2812a856226ffe94cfa007e0320884f4d29dca0e' 
  AND token = 'kZpJ6Tx7WL3ApucvqEV4FJddJ3ijcKUzWSE/2y9Bpq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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