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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9df7fbe21f208ffb8188dbc73c9a6d2be4585e7983be7f07ca0a9c268427cbd' 
  AND token = '+w5xjybUgLO8OmLVHKvIvya75nps4aRvIhar4MKm/LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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