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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acba4ee57598d3f42efdc03b1b52533f339a17447d0f5cb7f79a83b767d75d28' 
  AND token = 'Sue7GbbW09388c29sPBLfSRcATvieVUP5ZoOpMvoxaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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