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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d9bd9d68975bb35340c767e76e94e4e5397f8844923d96f99fe5190809e86db' 
  AND token = '8ohfZVGLAoojh9JJh7+9EDvF02hma0ofUwZvmiM3/mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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