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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ae6ade2fd6cf4f6519c9b9fdf897417e285aaeefeeed7f5d26f673b0e6913a' 
  AND token = 'H/dHTxvSK3SBqoDX5KUYCLmzXmcRXUj3clSndC/BJ1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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