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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '278867267cf599ee1faeccdf778d88854fb6ffa442f4c98a572a966117ebc359' 
  AND token = 'LJW4QoE3g3K17QgIHCVjUD64jYq6tI9vmS4siovJxto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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