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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75950a940dcb69416272ccc3695d9cff3fe3304fd33c3d3495f76061094e4ef' 
  AND token = 'vlZYU+Os4qOacUuklAs3AzwfxsilCpa26vFwpdp2qN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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