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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021d3e8c3780feb40d0ce8f2ee0c15460ceae94a03c7e2754ab6516ec252cf4b' 
  AND token = 'f7NG5Hvj1DhHYzWFBkoLMbTc7uHLgyQttHaOjS9Z580=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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