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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8463c80f08fbe786e97adffb0f459351d7c2a363bd0ef5f8982e9e66afbf2c5b' 
  AND token = 'j2MwoalAeQMy4spYvRutWKCJiJteR8xLgIbNRfnrC8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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