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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7a7f41a89149da90578b550d2acec7d242760f0bd296a4d880f373c0049021' 
  AND token = 'Au9YTldnSDWJ1y0hyLN97EcgD/s0T514j++zTJn+6X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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