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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea0d6a543772a111b2e51d718e3298c10319e86a8896a44c87ebd8ddf1d1884' 
  AND token = 'tfuWW7gCe7UEk5PXuw8H6UsetVd5XH5++rJPONiUlKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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