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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0daa661fb4b61ed7ef1d0bd2d133f909afb5a437b22e5a64f61147f5dcc5ff2' 
  AND token = 'RVaqukhQD468P4k6wlOlE9XXew6cG9w3UJlqmdpP2ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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