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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df22bae333d5bca77f172065402c73045f9fb79e59eb419c04d9b9572a84c00' 
  AND token = '+jValfqTmwaHTpGzpt/6jSECbj3Mz8JnA+i1jAOa7t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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