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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07376201bd5c47fa214ca58b8e8ecd3a56897993d6ebb1276dc6832c20aa4dc4' 
  AND token = 'KM+x+oOaj6rMhi21PtVUNIFhh5piQV027a3mZa2t9jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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