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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95c8c33b536b2e7f72ef904cfa7c0757a51422e825cad860ef5419ef18d9d060' 
  AND token = 'd96jzWFDX/9XvCWzHebiSlT9WF8cBULN02L7/HyWKUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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