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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fa1d9c1b7ca63a6b9e931290ef2341150f674017f56cd8560132a84aa181024' 
  AND token = '5MpnrIG70K9yC/lkrtPDvwnF1fV0V4/UhWfZugEczfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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