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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e98d4cf0608912ab469ca492cfbde8c180a014ce6c3fe81c7c63674fc2ad732' 
  AND token = 'I8nz3n1rWyrELol7zpofbPgl3LqlzfRttKxd47j3YTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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