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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed98c81d31cb0c86ed3aab94d33332cacccc5ef34be28258a7834a37b9a868f' 
  AND token = 'VPh2SAPJ9/clTVMzMcAKWdzHty0Kw2+WmmryuOeVK8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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