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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e9a5519851c4db372905715a95758228fd3d3185130da61b3423d4eb334dd5' 
  AND token = 'Wt9VFguUqhUAj3muROIRfooTZLzoLgJsAITW98zbwCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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