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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d3cfc969595a783c68e73c3fe8a400becd48024d9d8ffda77e07c0052341284' 
  AND token = 'GCsu9Alexk5/ih3IYvogjb/76Z/SJeqs8DuPN7/ozS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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