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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba5c8c6ab829af1dbc10538f0be6c0f90647b53ba2ca6a0779021a9ba6aa46b' 
  AND token = 'clDB53eBMVkKy3jB2jqX7I6ju7I8WH5/jZx1P2SLauQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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