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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d40a817259a847b2f4a7fef813e054466760cb43af10a5f970744c5fd72e27' 
  AND token = 'aEk3CXGtx0qBhGhnJAh6GUcw9fe0uZyoeYftvOw/494=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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