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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9e5f72a606566c37a3484655fd302229ece67824c2d02deccfa16a2dce3d8c' 
  AND token = 'dUkLLKNZ9AkIaPtnhi9wdHcPCy4fM+HJ+WW8Ar8sh3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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