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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80bdef6bd32fdd34489100ca5d0bdca4447cf5d7b959f937fedf2d3d04554b69' 
  AND token = 'zGC3Co8/JakWwYojhVak/LeE7AUyKQf5I/lXYzWe7tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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