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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad01cee0d376cb6ad3e2ba431a31d44306a87deb00827f00f5b575971f414ef0' 
  AND token = 'edIHA7xxk5cPIcyhf9cJouxmq3DjvA76h95QlLAImNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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