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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee446f8535e62341ae2393cb20f6e07d5cd5257fb02b5835ecaed5fb7e63f1c' 
  AND token = 'aVC+qSxpS/LMy7nh6BO16o9d3f7O3f74yFs90X4kvLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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