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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e0e8020265ee0e4ae518135e614f0be249901cbb65398039f95d06a8a1f23b' 
  AND token = 'km7bzkMipQePPFTRYPmdtg8YFbgxvuxaUnd4g6TvLXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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