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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c23b7e4002864317553906db0dd6ab2f6813823293eca99f3e319e09c7929a4' 
  AND token = '9J6mIiF7/jumR+vav9aY2g2UfY1YApI7AEPg3WL6CTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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