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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f12db5a08feec95ddc24f8f8f9cdc7c472ed00cf60cd9dd5a5796e4a6f6e280' 
  AND token = 'vDA+w4LY1POU4B5ORDZQg9+blj4DOnQnnD75FPX8n8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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