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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956ce529e44eebbdcfaf4bc82037b6bfb74f5d369be365e9c1f51df206261fcf' 
  AND token = 'p6yW9mZmRwUUSee59HrzkB5/EhbRnukOKCZ+rNTds+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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