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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4a5cd34dabbbe1529de84355ac9714308007c119a30c8d5b4b948521a5a00d' 
  AND token = 'lpRKoVHg0o6HfiazYAP2RDDh8Fn+aU9eElEy7HfTvVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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